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Switzerland captain Severin Luthi will tap the star power of Roger Federer and Stan Wawrinka when the Alpine country faces Italy in next month's Davis Cup, Swiss Tennis announced Wednesday.

World number three Federer and number four Wawrinka will team up with Marco Chiudinelli and Michael Lammer, 167th and 454th respectively in the ATP rankings.

Federer and Wawrinka had already
confirmed that they planned to take part in the September 12-14 matches
in Geneva, but Luethi's official announcement was required to make that
formal.

Tennis watchers had been left guessing about the remaining names, however.

"Marco
Chiudinelli has been in greater and greater shape over the past few
months and he's worked flat out to get ready for these semi-finals, so
he deserved his slot in the team," Luethi said in a Swiss Tennis
statement.

There had been suggestions that Luethi would call up Swiss number four Yann Marti, who stands 209th in the ATP rankings.

"I've
followed Yann Marti's recent rise with a lot of satisfaction, he's made
a lot of progress. But what's at stake is too important to start
experimenting with new players," said Luethi.

He said he expected Italy to
deploy a team exclusively of players from the ATP top 100, including
world number 17 Fabio Fognini,49th-ranked Andreas Seppi, plus Paolo
Lorenzi and Simone Bolelli, respectively 78th and 85th.

"This
isn't going to be a walk in the park, and it's going to be all the more
important to be buoyed up by our fans," said Luethi.